/*
GanttProject is an opensource project management tool.
Copyright (C) 2002-2011 Dmitry Barashev, GanttProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package net.sourceforge.ganttproject.action.task;

import java.util.List;

import net.sourceforge.ganttproject.GanttTree2;
import net.sourceforge.ganttproject.gui.UIFacade;
import net.sourceforge.ganttproject.task.Task;
import net.sourceforge.ganttproject.task.TaskContainmentHierarchyFacade;
import net.sourceforge.ganttproject.task.TaskManager;
import net.sourceforge.ganttproject.task.TaskSelectionManager;

/**
 * Move selected tasks up
 */
public class TaskMoveUpAction extends TaskActionBase {

    public TaskMoveUpAction(TaskManager taskManager, TaskSelectionManager selectionManager, UIFacade uiFacade, GanttTree2 tree) {
        super("task.move.up", taskManager, selectionManager, uiFacade, tree);
    }

    @Override
    protected String getIconFilePrefix() {
        return "up_";
    }

    @Override
    protected boolean isEnabled(List<Task> selection) {
        if(selection.size() == 0) {
            return false;
        }
        TaskContainmentHierarchyFacade taskHierarchy = getTaskManager().getTaskHierarchy();
        for(Task task: selection) {
            if(taskHierarchy.getPreviousSibling(task) == null) {
                // task is the first child of the parent
                return false;
            }
        }
        return true;
    }

    @Override
    protected void run(List<Task> selection) throws Exception {
        TaskContainmentHierarchyFacade taskHierarchy = getTaskManager().getTaskHierarchy();
        for(Task task: selection) {
            Task parent = taskHierarchy.getContainer(task);
            int index = taskHierarchy.getTaskIndex(task) - 1;
            taskHierarchy.move(task, parent, index);
        }
        forwardScheduling();
        // TODO Ideally this should get done by the move method as it modifies the document
        getUIFacade().getGanttChart().getProject().setModified();
    }
}
